Why do fire flies glow at night?

Explanation

**Step-by-Step Solution:**

1. **Understanding Fireflies**: Fireflies are insects known for their ability to produce light, particularly at night.

2. **Presence of Luciferin**: Fireflies contain a special substance called luciferin. This is a protein that plays a crucial role in their ability to glow.

3. **Oxidation Process**: The luciferin undergoes a chemical reaction known as oxidation. This process requires atmospheric oxygen.

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